Joomla administration user level - joomla

In my website project, three people are assigned to write new articles for the website. They write their own articleS and cannot view their fellows' articles. We have one supervisor who is supposed to view, edit, and manage all articles.
Can Joomla! or any free extension make this possible?

The core Joomla install does NOT do what you have requested but by adding a component called JUGA, you can easily configure exactly what you want.
http://extensions.joomla.org/extensions/access-a-security/backend-a-full-access-control/2587

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Joomla - Blog Builder Site

Does anybody know if it's possible to create a Blog builder site with Joomla CMS?
There is a lot of extensions to create a personal blog with personal articles. But I wanted to try to make a site like blogger.com but in simple version. So that users can register and add their own blogs and create their articles inside the blogs.
Are there any extensions with this functionality?
I guess the simpliest multiuser blog will be if the site allows registering and creating articles. And then these articles will be moved to one blog page or sorted by categories. But I need to divide the users activity to separate categories (named "blogs").
Try Zoo or k2, both of these allow for blogging functionality.

Add static javascript to every page of joomla

Im completely new to Joomla development. I need to develop Joomla plugin that adds static javascript to the footer of all the pages of a Joomla site. Also, the plugin would need to save 2 fields in database, and access these fields on per page basis. Also, Admin panel is needed.
Now, my questoion is, where do i start? Joomla plugin development is a big task, so if I can get some pointers as to where to start, it would be very supporting.
Im not asking for direct code, but just the right direction to start.
Thanx in advance....
Joomla has three types of extensions (what you refered to as plugin): components, modules and plugins, where each has a different purpose.
If you need to add javascript to all pages, the best place is your template. If you don't have access to template, just building an extension, then you have to create a content plugin.
If you need to create extension with admin panel which also works with database, you need to create a component. The best place to get started is tutorial Developing a MVC component for Joomla 2.5

Seminar listing for Joomla 2.5

I have searched the entire Joomla Extension Directory .But could not find a component which meets my requirments.
I need a joomla component for seminar listing.
To post seminars and Training. Visitor to the site should be able to post training and seminars(But publish after admin approval) .
I can buy commercial components also.
Thank you
You could use a directory component like Mosets Tree. It allows visitors to post listings subject to admin approval and comes with all the usual category features, modules, etc. Each listing will have it's own dedicated page with info, email, gallery, etc, all of which are togglable.
http://extensions.joomla.org/extensions/directory-a-documentation/directory/233
I think Sobi Pro offers similar functionality
http://extensions.joomla.org/extensions/directory-a-documentation/directory/16649

Joomla extension for people posts with categories

Are there any type of extensions that let people post what they want with categories. So they need to sign-up and sign-in, and then create a new post, then select the relative category that the post will be shown in to other people.
I may need to show posts by geo-localisation restriction, for example, posts appears in just US or UK.
I'm a PHP developer. I can achieve this system, but I wondered if it does already exist some CMS like Joomla doing what I need, to save time. I may also be able to develop such Joomla modules if it's allowed. Please need a push around these requirements since I don't have too much experience with Joomla.
I would recommend you use the article section of joomla which is a built in one. I think the things available in joomla package will suit your category, post and signin and signup requirements.
For geo-localisation restrictions I think your php knowledge is more than enough to change or modify few parts of the code in the joomla. I think this way will help you save some time. I have done these before.They have worked fine for me. Hope this helps you.

joomla - how can I create new content types in joomla

I'm new to joomla. I have been using Drupal for quite some time.
I would like to created new content types for news and announcements. How may I accomplish creating new content type in Joomla without installing a new module.
You're coming from Drupal so I am thinking that what you're looking for and cannot find in Joomla is something like CCK (Content Construction Kit)
Unfortunately this is not available by default in Joomla. You have to use extensions to create new types of content that contain specific fields.
Best free CCKs available for Joomla :
Form2Content (my favorite)
K2 (most popular, highly recommended)
You can find more in Joomla Extension Directory
I would say the same, for me i always use k2 as it integrates with many plugins and modules also featuring rich content forms
As per the answer from #Ahmad, install a CCK to add new content types.
In your case however, the built in Joomla functionality may suffice such as creating content categories for news and announcements and choosing menu options or modules to suit.
While K2 is a great CCK, there is a table named "jos_content_types", which makes me think, that joomla can handle content-types as well.
With different views, form-xml files and so one.
I found it while looking on this page: https://docs.joomla.org/J3.x:Using_Tags_in_an_Extension
But i didn't find any doc about creating new content-types easily by now. Does someone have more infos, how to create a new content-Type? Or is it just a new component, we have to create?

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